Friction shock absorbing mechanism



I Oct. 18, 1932. s. B. HASELTINE FRICTION SHOCK ABSORBING MECHANISM Original Filed Sept. 26, 1923 2 Sheets-Sheet l Inverdbr v 6&zcyfl/FZ5M Patented Oct. 18, 19.32

' UNITED AT s PATENT OFFICE; v

STACY B. HASELTINE, F CHICAGO,Ill'rLIlfl'fJIS, ASSIGNOR T0 W. H. MINER, IN.G.,.OFI

CHICAGO, ILLIHOIS, A CORPORATION OF DELAWARE rnrcrionfsnocx ABSORBING MECHANISM v Original application filed septembe'r 26,

1923,5eria1 No. 864,867. Divided and this application fild July 7,

' .1928; Serial No. 291,066.

This invention relates to'improvements in friction shock absorbing mechanisms.

This application is a divisionof my co pending application for friction shock absorbing mechanisms, Serial No.- 664,86T, filed September 26, 1923;

One object of the invention is to provide a friction shock absorbing mechanism in cluding a central friction post, shoes having wedge pressure transmittingmeans, wherein" is obtained high frictional capacity combined with assured release, the arrangement. being such that a high frictional capacity is developed during the compression'by a system of relatively blunt and keenangle wedge and friction elements cooperating with the" frie "tion'shoes. Other and further objects of the invention 29 will more clearly appear'from the description and claims hereinafter following. 1

In the drawings, forminga part of this specification, Figure 1 is a longitudinal, sec-1' tional view of a part of a railway draft rigging, illustrating my improvements in connection therewith, the section through the follower, friction elementsand other parts corresponding to twosection planes approximately 120 apart. Figure 2 is a vertical, e transverse, sectional View, corresponding sub stantially to the line 22. of Figure 1. Figure 3 is a view similar to Figure 1 of the" front end portion of the shock absorbing mechanism, illustrating a diiferentembodiment of the invention. And Figure 4 is an elevationalview of a wedge ring employed in connection with the embodiment of the invention illustrated in Figure 5. A0 In said drawings, 10- 10 indicate the usual channel-shaped center or draft sills of the railway car underframe, to the inner "faces of which are secured front stop lugs 11-11 and rear stop lugs12-12 of usual construction. The inner end portion of the coupler shank is designated by 13, same having operatively connected thereto a hooded yoke 14: of well-known form,-w-ithin which is disposed a shock absorbing mechanism proper, hereinafter described. The yoke and the parts frictional engagement therewith, and a therewithin aresupported by a detachable saddle plate 15 secured to the draft sills. Referring first to the embodiment of the invention illustrated in Figures 1 and 2, the

improved shock absorbing mechanism proper comprises a combined 'front follower and wedge casting A; a rear follower casting B; a friction post C; threefriction shoes D'D; three wedge blocks E-E three wedge blocks FF; four stop members G-G; a main spring resistance H; and a'pai-r of retainer bolts K.

The combined front follower and wedge casting A is of hollow construction and comprises a top wall'1 6 and a bottom wall 17 a front wall 18; a rear wall 19; and three longitudinally arranged walls 20-20 extending from the front wall 18 to the rear wall 19, the longitudinally extending walls 20 beingconnectedby curved web portions 21-21 and-defining a casing in which the wedge 'fllClilOIl shoes are housed. 7 As clearly shown in Figure 2, the walls 20 are arranged symmetrically about the axis of the gear and are provided at the front ends'thereof with interior, rearwardly diverging flat wedge faces 2222- extending at a relatively keen wedge acting angle with reference to the longitudi nal' axis of the mechanism. I

Rearwardly of the wedge faces22, the side walls 20 are inwardly enlarged, as indicated at 23, the enlarged sections 23 being each provided with a wedge face 24, also disposed at a relatively keen wedgeacting angle with respect to the longitudinal axis of the mechanism. It will be evident that the combined follower casting and wedge member A is thus provided with three sets of keen wedge faces,

the'wedge faces of each set being arranged I the V-shaped friction surfaces 28 of the post, C. At the outer side, each friction shoe D is provided with a face 30,slightly inclined with respect to the longitudinal axis of the mechanism and adapted to form a longitudt nally disposed flatfriction surface. At the rear end portion beyond the surface 30, each friction shoe D is provided with a rearwardly and outwardly inclined face 31, extending ata relatively blunt angle with reference to the longitudinal axis of the mechanism. 7

The three wedge blocks EE are of similar design and are adapted to cooperate re'spectively with the front end portions of the-three friction shoes D. Each wedge block E 1s pro vided witha flat inner surface 32, adapted to V engage the friction surface .30 of the corresponding friction shoe. At the forward end thereof, each block E is provided with a wedge face 33 engaging one of the wedge faces 22 of the wedge casing A, At the rear end, each block Eis providedwitha relatlvely blunt wedge face 83, adapted to cooperate with the front end of one ofthe wedge blocks F.

The three wedge blocks F are also of similar design and each block is provided with a wedge face 34 on the outer side thereof,

adapted to cooperate with one of the wedge faces 24 of the front follower member A. At the inner end, each-block F-has a relatively blunt wedge face 35 en agin the blunt wedge face 31 of the corresponding friction shoe.

At the forward end, each block F is provided with a relatively short blunt wedge face 36 which engages directly the rear wedge face 83 of the corresponding wedge block E. As most. clearly shown in Figure 1, the wedge blocks F are spaced slightly from the friction surfaces 30 of the friction shoes D in the normal full release position of the parts.

The spring resistanc H, which comprises a relatively large single coil, is interposed between the we'b26 of the rear follower B and the friction shoes D, a spring. follower ring 37 being interposed between the front end of the spring and the inner ends of the friction shoes. As shownin Figure-1, the friction shoes are circumferentially cut away at the inner'ends to accommodate the sp'ring'follower ring 37, sufiicient clearance being pro-. vided to'permit the necessary lateral outward A and the movement of the friction shoes, due to the tapered form of the friction post C.

The stop members G are four in number, extending longitudinally of the mechanism and are located at the corners of the followers, being suitably mounted between bosses 3838 on the rear follower B and bosses 3939 on the front follower A, and extending loosely through aligned recesses in the web 26 and the rear wall 19 of the follower A. The stop-members G are of such a length ranged 1n opposite sides of the gear midway of its height, each bolt having the rear end thereof anchored to the web 26 of the rear follower B and its front end anchored to the wall 19 of the front follower A.

The operation of the improved shock absorbing mechanism. illustrated in igures l and 2, assuming a compression stroke of the mechanism,

rear follower B will be moved toward each other, thereby setting up a .wedging actionbetween the front follower and the wedge blocks E and F, forcing the latter against the friction shoes D. The shoes will thus be pressed tight-l against the friction surfaces of the post and also carried inwardly of the post, due to the inward movement of the follower A. During the inward movement of the shoes D, the main spring resistance H will be compressed and the shoes will be forced laterally apart, due to the taper of the post; During the lateral outward movement of the shoes, a differential action will be had, the wedge faces of the blocks E slipping on the wedge faces 22 of thefollower A, sufiicient clearance being provided between the inner ends of the blocksE and the enlargements 23 of the side walls of the follower A to accommodate the relative slipping movement of the wedge'faces. As the blocks E slip on the wedge faces of the follower A, they will be forced inwardly of the mechanism with respect to the follower A. The shoes D, in their lateral outward movement, also slip on the wedge faces 35 at the inner ends of the blocks F and the blocks F, which are forced rearwardly by the slippage of the blocks E, will also slip on the wedge faces 24 of the follower A. Due to the differential action of the wedge blocks E and F, the en-.

tire friction wedge system will belongitudiis as follows: The front follower It'll toward each'other will be limited by the stop members G,'thereby relieving the main spring resistance from undue Compression.

Upon removal of the compression force, the follower A will fall away from the wedge blocks E and F, thus relieving the pressure on the latter and the shoes D, permitting the spring resistance to restore all the parts to p the normal full release position;

Referring next to the embodiment of the invention illustrated in Figures 3 and 4,.the follower and the post 51 are, except as hereinafter pointed out, similar to the follower A and the post C oftlie' form of the invention hereinbefore described, the follower 50 being provided with three longitudinalwalls,5252 and three interior wedge faces 438-53, which are disposed at a relatively keen wedge acting angle with respect to the longitudinal a'xisof the mechanism. The post is also provided with three arms '5t54; and three rearwardly diverging V- sha ed friction surfaces 55-55. Three friction shoes 5'656 cooperate with the postand have V-shape'd friction surfaces which engage with the V-shap'ed fricti'o'nsurfaces 55. On the outer side,each shoe 56 is provided with a longitudinally disposed friction surface 57,

' which, as shown, is arranged at an 'angle to the inner friction surface of the correspond- 7 ing shoe. The friction surfaces 5710f the three shoes preferably converge inwardly of the mechanism. are interposed betweenthe friction shoes and the wedge facje's53 of the follower 50. Each block 58 is provided with a friction surface on the inner side thereof, cooperating with the friction surface 57 of the corresponding shoe. Atthe front end, each block 58 is provided with a wedge face 59, disposed at a relatively keen wedge acting anglewith re- V spect to the longitudinal axis of the mechanism and cooperating with the corresponding wedge face 53 of the follower 50.

At the inner end, each shoe 56 is provided with a lateral enlargement having a relatively blunt wedge face 60 at the front side thereof. A wedge ring 61 is interposed between the inner ends of the blocks 58 and the enlargements 60 of the friction shoes, the wedge ring being faces 62 and 63 on the opposite sides thereof,

adapted to cooperate respectively with theblocks 58 and the enlargements 60 of the shoes. The wedge faces 62 engage relatively blunt wedge faces at the inner ends of the blocks 58. The details of construction of the shock absorbing mechanism illustrated in Figures 3 and 4 otherwise corresponds in all respects to the construction. shown in Figures 1 and 2, the same being provided with a rear follower on which the friction post is mounted and the followers being connected by retainer bolts and having stop members interposed therebetween for limiting the relative Three wedge blocks 58-58 provided with three sets ofwedge inwardly,

against the post. As the follower 50 moves inwardly, the wedge blocks 58 will force the wedge ring 61 rearwardly, through engagement-"with the enlargements of the friction shoes, forcing the shoes rearwardly also. I

As the shoes move rearwardly on the friction surfaces of the post,'they will be gradually spread apart, due to the taper of the post forcing the wedge blocks outwardly also, thereby effecting a differential action, the

faces 59 slipping on the faces 53 of vthe follower and thefaces at the innerends of the wedge blocks slipping on the wedge faces-of the ring 61. Thewedge faces 60 of the shoes at the same time will slip on the wedge faces 63 at the inner side of the ring. The shoes will thus be forced rearwardly relative to the the latter in turn, 7

follower 50 and the wedge blocks 58, slippage thus occurring between the'engaged faces of the shoes and the blocks; Upon removal of the compression force, the follower '50- will drop away from the wedges 58, thus relieving the pressure-on the latter and the shoes 56, permitting the spring resistance to restore all "of the parts "-to the normal full release position.-"

While I -have herein shown anddescribed what I consider-the preferred manner of carrying out my illustrativeand I contemplate all changes and "modifications which come within the scope of the claims appended hereto.

1 I claim; 7 7

1. In a friction shock absorbinglmecha- -nism,thecoinb'nat1on with front and rear followers movable relatively toward and away from each other of atapered central friction posthaving exterior friction surfaces diverg: ing inwardly-of the mechanism friction shoes cooperating with the post friction surfaces; a spring resistance; and a operatingwith the shoes, pressure transmitting member and avplural- "ityzof setsof wedge blocks, each'set including two blocks,each having wed-ging engagement with said 'we'dgelpressure transmitting memher, one-of said blocks having frictional engagement'with'one of'the shoes andthe other of said blockshaving wedging engagement 1 fwith said shoe.

q 2. 111 affriction shock "absorbing mechainvention, the same is merely.

wedge system co- JIlCllldlIlg a wedge nism, the combination with front and rear followers movable relatively toward and away fromeach other;-of a tapered central friction post havingv exterior friction surfaces diverging inwardly of the mechanism; friction shoes cooperating with the post friction surfaces; a spring resistance; and, a wedge system cooperating with the shoes, including a wedge pressuretransmitting member and a plurality of sets of wedge blocks each set including a pair of blocks having cooperating wedge faces, said pair of blocks both engaging one of said shoes and the blocks of each pair having wedging engagement with the wedge pressure transmitting member. I

3. In a frictionshock absorbing mechanism, the combination with a tapered friction post; of a wedge casing, said post and casing being relatively'movable toward and away from each other, said casing havinga plurality of sets of interior wedge faces; a

plurality of friction shoes having frictional withone of said sets of casin g engagement with the post; a main spring resistance opposing relative movement of the shoes and post; and a set of wedge blocks engaging each shoe, the wedge blocks of said set having wedging engagement respectively wedge faces of the 4. In ajfriction shockabsorbing mecha:

nism, the combination with a tapered friction mitting member along faces inclined at a V relatively keen angle with respect to the lon- V blocks having frictional engagement with one i post; of a wedge casing, said post and casing being relatively movable toward and away from'each other, said casing having a plurality of setsof interior wedge faces; a plurality of friction shoes having engagement with the post; a main spring resistance opposing V ing wedging engagement with said shoe along faces inclined at an angle to the longitudinal axis greater than the angle of the cooperating faces of said block and pressure-transmitting member. v

' 6. In a friction shock absorbing mechanism, the combination with front and'rear followers; of a tapered central friction post movable with one of said followers, said post having exterior friction surfaces diverging inwardly of'the mechanism; friction shoes cooperating withthe post friction surfaces; a main spring resistance; and a wedge system cooperating with the shoes, including a wedge pressure transmitting member and a plurality of sets of wedge blocks, each set including a pair of blocks having cooperating wedge faces inclined with respect to the longitudinal axis of the mechanism at a relatively blunt angle, said pair of blocks both engaging one of said shoes, one of said blocks having fricv I 9b and second named cooperating wedge faces.

In witness that I claim theiforegoing I have hereuntQsubsGribed my name this 5th dayof Julyl928. v v V j- STACY B. HASELTINE relative movement of the shoes and post; and t a set of wedge blocks cooperating with each shoe, one of the wedge blocks of said set having frictional engagement with the shoe and the other wedge block of said set having wedg- 7 ing engagement with said shoe, said blocks having wedging engagement with each other and wedging engagement with the respective r wedge faces of oneof said sets ofthe casing.

-,5.,In a friction'shock absorbing mechanism, the combination with front and rear followers relatively'movable toward and away from each other; of a tapered central frie V tion'post having exterior friction surfaces diverging inwardly of the'mechanlsm; friction shoes cooperating withthepost friction surfaces; a spring resistance; and a wedge system cooperating with the shoes, including a wedge pressure transmitting member and a plurality of sets of wedge blocks, each set including two blocks, each having wedging engagement with said wedge pressure transgitudinal axis of the mechanism, one, of said. a

of the shoes and the other of said blocks hav- 

